package com.gongj.shej.utils;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.ApplicationEvent;
import org.springframework.core.env.Environment;
import org.springframework.stereotype.Component;

/**
 * @program: shej
 * @description:
 * @author: gongj
 * @Description: TODO
 * @create: 2020-07-23 19:59
 **/
@Component
public class SpringUtil implements ApplicationContextAware {

    private static ApplicationContext applicationContext;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        if(SpringUtil.applicationContext == null) {
            SpringUtil.applicationContext = applicationContext;
        }
    }

    //获取applicationContext
    public static ApplicationContext getApplicationContext() {
        return applicationContext;
    }

    //通过name获取 Bean.
    public static Object getBean(String name){
        return getApplicationContext().getBean(name);
    }

    //通过class获取Bean.
    public static <T> T getBean(Class<T> clazz){
        return getApplicationContext().getBean(clazz);
    }

    //通过name,以及Clazz返回指定的Bean
    public static <T> T getBean(String name,Class<T> clazz){
        return getApplicationContext().getBean(name, clazz);
    }


    /**
     * 发布事件
     *
     * @param event
     */
    public static void publishEvent(ApplicationEvent event) {
        applicationContext.publishEvent(event);
    }

    /**
     * 获取环境信息
     */
    public static Environment getEnvironment() {
        return applicationContext.getEnvironment();
    }
}
